feat(tools): 添加 CLI 模块管理命令和文档验证 demos

- CLI 新增 list/add/remove 命令管理项目模块
- 创建 demos 包验证模块文档正确性
- 包含 Timer/FSM/Pathfinding/Procgen/Spatial 5个模块的完整测试

packages/tools/demos/package.json

@@ -0,0 +1,26 @@
+{
+    "name": "@esengine/demos",
+    "version": "1.0.0",
+    "private": true,
+    "description": "Demo tests for ESEngine modules documentation",
+    "type": "module",
+    "scripts": {
+        "test": "tsx src/index.ts",
+        "test:timer": "tsx src/timer.demo.ts",
+        "test:fsm": "tsx src/fsm.demo.ts",
+        "test:pathfinding": "tsx src/pathfinding.demo.ts",
+        "test:procgen": "tsx src/procgen.demo.ts",
+        "test:spatial": "tsx src/spatial.demo.ts"
+    },
+    "dependencies": {
+        "@esengine/timer": "workspace:*",
+        "@esengine/fsm": "workspace:*",
+        "@esengine/pathfinding": "workspace:*",
+        "@esengine/procgen": "workspace:*",
+        "@esengine/spatial": "workspace:*"
+    },
+    "devDependencies": {
+        "tsx": "^4.7.0",
+        "typescript": "^5.8.3"
+    }
+}